WO2012079688A1 - Dispositif d'alimentation en air comprimé et système pneumatique - Google Patents

Dispositif d'alimentation en air comprimé et système pneumatique Download PDF

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Publication number
WO2012079688A1
WO2012079688A1 PCT/EP2011/005863 EP2011005863W WO2012079688A1 WO 2012079688 A1 WO2012079688 A1 WO 2012079688A1 EP 2011005863 W EP2011005863 W EP 2011005863W WO 2012079688 A1 WO2012079688 A1 WO 2012079688A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressed air
air supply
valve
pneumatic
solenoid valve
Prior art date
Application number
PCT/EP2011/005863
Other languages
German (de)
English (en)
Inventor
Dieter Frank
Frank Meissner
Uwe Stabenow
Original Assignee
Wabco Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=45033925&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2012079688(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wabco Gmbh filed Critical Wabco Gmbh
Priority to EP13005906.6A priority Critical patent/EP2743103B2/fr
Priority to US13/993,839 priority patent/US9694801B2/en
Priority to ES11787798T priority patent/ES2525020T5/es
Priority to EP11787798.5A priority patent/EP2651671B2/fr
Publication of WO2012079688A1 publication Critical patent/WO2012079688A1/fr
Priority to US15/594,664 priority patent/US10093144B2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • B60G17/0528—Pressure regulating or air filling valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/26—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs
    • B60G11/27—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs wherein the fluid is a gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/002—Air treatment devices
    • B60T17/004—Draining and drying devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/07—Off-road vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/201—Air spring system type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/201—Air spring system type
    • B60G2500/2012—Open systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/202—Height or leveling valve for air-springs
    • B60G2500/2021—Arrangement of valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/203—Distributor valve units comprising several elements, e.g. valves, pump or accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/204—Pressure regulating valves for air-springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/204—Pressure regulating valves for air-springs
    • B60G2500/2044—Air exhausting valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • B60G2500/302—Height or ground clearance using distributor valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/22—Magnetic elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/22—Magnetic elements
    • B60G2600/26—Electromagnets; Solenoids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/264—Electrical control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining

Definitions

  • the invention relates to a compressed air supply system according to the preamble of claim 1. Furthermore, the invention relates to a pneumatic system according to the term Ob of claim 14 with such a compressed air supply system and a method according to the preamble of claim 15 for operating a pneumatic system.
  • a compressed air supply system is used in vehicles of all kinds, in particular for supplying an air spring system of a vehicle with compressed air.
  • Air suspension systems may also include level control devices, with which the distance between the vehicle axle and vehicle body can be adjusted.
  • An air-blowing system of a pneumatic system mentioned at the beginning comprises a number of air bellows pneumatically connected to a common line (gallery) which, as the filling increases, can lift the vehicle body and correspondingly lower it with decreasing filling. With increasing distance between the vehicle axle and vehicle body or ground clearance, the spring travel longer and larger bumps can be overcome without causing a contact with the vehicle body.
  • Such systems are used in off-road vehicles and sport utility vehicles (SUVs).
  • SUVs sport utility vehicles
  • a compressed air supply system for use in a pneumatic system with a pneumatic system is operated with compressed air from a compressed air supply, for example, within the framework of a pressure level of 5 to 20 bar.
  • the compressed air comes with an air compressor (Compressor) of the compressed air supply provided.
  • the compressed air supply is pneumatically connected to the supply of the pneumatic system with a compressed air connection and on the other hand pneumatically connected to a vent port. Through a vent valve arrangement, the compressed air supply system can be vented to the vent connection by discharging air.
  • An air dryer with which the compressed air is to be dried.
  • An air dryer has a desiccant, usually a granular bed, which can be traversed by the compressed air, so that the granular bed - at relatively high pressure - can absorb moisture contained in the compressed air by adsorption.
  • An air dryer may optionally be designed as a regenerative air dryer.
  • DE 199 11 933 B4 discloses a compressed air generator with an air dryer with a first compressed air supply line, wherein the compressed air passes through a desiccant and with a second compressed air supply line without passing the compressed air through the desiccant.
  • An aforementioned compressed air supply system is also disclosed in EP 1 165 333 B2 in the context of an initially mentioned pneumatic system with an air spring system.
  • This has in addition to a separately lockable main vent line on a high-pressure vent line, which is connected in parallel to the main vent line with an additional high-pressure vent next to the pneumatically controlled with a control valve main vent valve in the main vent line.
  • the free flow area of the separate high-pressure vent valve is lower than that of the main vent valve.
  • Such a compressed air supply system can still be improved. It has been shown that when venting such a compressed air supply system via the high-pressure vent line, the deaeration of dry air takes place, which is not used for the regeneration of the desiccant. This is equivalent to an unnecessary waste of dry air, especially in the event that a suitable for the above applications, flexible, fast, yet reliable operation of the compressed air supply system with a correspondingly high actuation rate should be required.
  • a compressed air control device with an air dryer in the housing a cup-shaped drying container is contained, the inside of Ü over the housing on the one hand with a pressure medium source and on the other hand with a connection element in the form of a pressure accumulator and / or an air spring on a can be connected to this opening valve, wherein the housing has an air inlet and an air outlet in each case for the compressed air, which is guided to fill the at least one connection element in a flow direction from the air inlet through the drying container to the air outlet and for emptying in the opposite flow direction from the air outlet forth is discharged through the drying container and the housing and from the latter.
  • a controllable directional control valve is integrated and built into the housing of the air dryer, which serves for the discharge of the air into the housing interior and the drying container during emptying.
  • a directional control valve controlling the discharge channel is actuated by at least one further controllable directional control valve with the pressure during emptying, wherein this magnetic valve arrangement is arranged substantially outside the housing of the air dryer.
  • the outlet valve and a regulating pressure regulator are connected to a hollow rod through the container of the air dryer containing the desiccant.
  • the object of the invention is to provide an apparatus and a method which is improved with respect to the prior art.
  • an alternative solution to the prior art is to be specified, which eliminates the disadvantages associated with a normally closed solenoid valve.
  • a ventilation and / or drying capacity of the compressed air supply system should be improved.
  • the object with regard to the device is achieved by a compressed air supply system of the type mentioned, in which according to the invention the features of the characterizing part of claim 1 is provided.
  • the object with regard to the method is achieved by a method according to the invention of claim 15.
  • the invention is based on the consideration that in the case of a normally closed solenoid valve in the context of a designed as a solenoid valve assembly vent valve assembly - especially in the case of an unintentionally adhering to the valve seat anchor or the like. Valve body - there is a risk that unintentionally with excessive air delivery of the air compressor overpressure the compressed air supply system is created. In the worst case, this can also spread to a pneumatic system of a pneumatic system and cause damage in the pneumatic system.
  • a pressure limiter for the compressed air supply system is additionally provided, for example in the form of a safety valve or the like.
  • a pressure limiter with the solenoid valve assembly for. B. on a solenoid valve for direct switching of a total compressed air volume or on a relay valve, be realized or possibly. Even omitted.
  • a current-controlled and / or current-adjustable pressure limiter in the normally open solenoid valve assembly is provided with significant advantages over the previous use of normally closed solenoid valve assemblies. The invention has recognized that the
  • the concept of the invention proposes to use a solenoid valve arrangement in which the pneumatic part is opened when the magnet part is not activated, in particular when the magnet part is de-energized.
  • a normally open solenoid valve arrangement Such an arrangement is also referred to below as a normally open solenoid valve arrangement.
  • the pneumatic part of the solenoid valve arrangement which can be actuated directly via the magnet part of the solenoid valve arrangement is opened in a vent line or other branch line of the compressed air supply line between a pressure-side valve connection (X) and a vent-side and / or control-side valve connection (Y, Z).
  • the concept of the invention advantageously comprises, in a first variant, a solenoid valve arrangement for directly switching a compressed air volume.
  • a solenoid valve arrangement has only a single or a plurality of vent valves.
  • a compressed air volume can be switched directly through the single vent valve.
  • these can be realized, for example, as a primary vent valve and secondary vent valve.
  • the primary bleeder valve and the se- As required, the secondary vent valve can be switched one after the other or individually to vent a compressed air volume.
  • Such a directly controlled vent solenoid valve assembly is in particular free of a control valve.
  • It may comprise a single or a plurality of compressed air volume switching solenoid valves, of which at least one or a part or all of them are normally open according to the concept of the invention.
  • normally open single anchor or double anchor solenoid valves are suitable.
  • the concept of the invention is not limited to a directly controlled solenoid valve arrangement.
  • the concept of the invention advantageously comprises - in a second variant - an indirectly controlled normal venting arrangement for the indirect switching of a compressed air volume, in which a control valve exposed to a total pressure is provided for controlling a relay valve.
  • a normally venting arrangement the pneumatic part of the control valve is opened in a non-activated state of the magnetic part of the control valve, so that the relay valve is in a pilot-controlled state.
  • the relay valve opens immediately; As a result, the relay valve proves to be virtually dead.
  • Fig. 8 an embodiment of a normally venting, indirectly controlled vent solenoid assembly is shown for a vent valve assembly. An air dryer is shut off by a separate non-return valve to the pneumatic system.
  • the concept comprises - in a third variant - a solenoid valve arrangement in the form of an indirectly controlled solenoid valve arrangement.
  • This may be a fast venting arrangement for indirect switching of a compressed air volume, in which a partial pressure exposed control valve is provided for controlling a relay valve.
  • a partial pressure exposed control valve is provided for controlling a relay valve.
  • the pneumatic part of the control valve is opened in an indirectly controlled fast-ventilating arrangement, so that the relay valve is in a pilot-controlled state.
  • the relay valve opens immediately; the relay valve proves to be practically open as a result.
  • Fig. 9 there is shown one embodiment of a fast venting indirectly controlled vent solenoid valve assembly for a vent valve assembly.
  • An air dryer is open via a regeneration throttle to the pneumatic system.
  • An indirectly controlled valve assembly - fast or normal venting - may be understood to be similar to a servo-controlled valve assembly or positively controlled valve assembly.
  • a directly controlled valve arrangement has one or more directly controlled valves, which are easier to implement.
  • the concept of the invention of a normally open solenoid valve assembly avoids the disadvantage of a so-called valve adhesive, d. H. the disadvantage of a valve body adhering to the valve body, since the valve body is not arranged for the longest time at the valve seat at a normally open solenoid valve.
  • self-cleaning of the valve seat is given with constant flow of a normally open solenoid valve. This applies in particular to a directly controlled solenoid valve arrangement.
  • the compressed air supply system is advantageously protected against the external entry of contaminants.
  • a pneumatic part of a solenoid valve assembly include in particular the pneumatically acting parts, such as the valve as such with valve body, valve seat, valve seal, valve housing or the like.
  • a magnetic part of a solenoid valve assembly include in particular the electrically and / or magnetically acting parts, such as actuation and control means for the valve with coil, armature, bobbin, control line or the like.
  • the invention leads to a pneumatic system with a compressed air supply system according to the invention.
  • the normally open solenoid valve arrangement is designed for direct switching of a total compressed air volume, so preferably designed in the form of a normally open directly controlled vent solenoid valve assembly free of a control valve.
  • the pneumatic part of the solenoid valve arrangement in the vent line between a pressure-side valve port (X) and a vent-side valve port (Z) may be open.
  • a vent branch line or the like - a second throttle arranged.
  • the nominal diameter of the first throttle is preferably below the nominal diameter of the second throttle. This advantageously leads to the greatest pressure drop occurring at the air dryer. This in turn results in a comparatively high pressure swing amplitude at the air dryer, which is particularly advantageous for the regeneration of the air dryer in the context of pressure swing adsorption.
  • a valve for holding a residual pressure is arranged in the vent line.
  • a valve for holding a residual pressure is arranged in the vent line.
  • a residual pressure function is achieved via a pilot-operated relay piston of the relay valve.
  • the residual pressure function is preferably designed to maintain a residual pressure in particular of 1 to 3 bar, preferably in the range of above 1 bar, in particular at least 1.5 bar, in the system, ie in the compressed air supply system and / or the pneumatic system.
  • a residual pressure has proven to be advantageous in order to maintain a sufficient residual pressure in the bellows of an air spring system. This avoids accidental collapse or pinching of the bellows.
  • the solenoid valve arrangement for the indirect switching of a total compressed air volume with a control valve for controlling a relay valve which is exposed to a total pressure, i. H.
  • the solenoid valve arrangement is formed in the form of a normally venting indirectly pilot-controlled arrangement.
  • the pilot-operated relay valve forms a residual pressure function.
  • a pressure limiter in the relay valve can be realized advantageously via a valve spring.
  • a pressure limiter can be provided in all further variants of the invention, in particular also on a valve of a solenoid valve arrangement for direct switching of a compressed air volume.
  • the solenoid valve arrangement is provided for the indirect switching of a total compressed air volume and has a control valve exposed to a partial pressure for controlling a relay valve, i. H.
  • the arrangement is formed as an indirectly pilot operated fast venting solenoid valve assembly.
  • the pilot-operated relay valve assumes a residual pressure function.
  • a separate check valve is advantageously not necessary.
  • a pressure limiter can be realized with the relay valve via a valve spring.
  • the solenoid valve arrangement has a current-adjustable pressure limiting. It has been shown that a pressure limiter, as far as it is realized by a spring load of a valve by means of a valve spring, can be adjusted only within certain limits.
  • a sufficiently flexible supply of the pneumatic system in particular air spring system
  • a compressed air supply system to provide a pressure limiter which can be set over a comparatively large pressure range.
  • the development provides that the solenoid valve arrangement has a current-adjustable pressure limiter. Pressures for reliably filling a reservoir in an air spring system may, if appropriate, be very different from pressures for filling a bellows of an air suspension system.
  • a continuously adjustable pressure limiter allows a variable and flexibly adjustable pressure limitation within a range of between 10 and 30 bar. In addition, a sufficiently wide tolerance range of pressure limits can be taken into account in such an area.
  • the pneumatic part of the solenoid valve arrangement has an opening pressure which can be set in current via the magnet part.
  • a maximum pressure of the solenoid valve arrangement can be set comparatively low by a lower current and a higher current can be set comparatively high in a normally open solenoid valve arrangement.
  • a bellows of an air suspension system can be protected against overcharging, for example, overcharging above a pressure of 1 1 to 13 bar.
  • a memory of an air spring system can be protected from overcharging, for example above a pressure of 20 to 25 bar.
  • a flow-adjustable pressure limiter proves to be particularly advantageous if it can replace a mechanically acting pressure relief valve.
  • the compressed air supply system is formed in the form of a device with a housing assembly having a number of housing areas.
  • the compressed air supply system can be segmented or modularized as needed in a favorable number of areas.
  • a drive is arranged in a first region.
  • the air compressor drivable by the drive is arranged in a second region. It is advantageous in a third area connected to the second area via a pressure source interface to the air dryer and the Magnetventilanord- included. This division has proved particularly by arranging the first to third area in a U-shaped arrangement.
  • interfaces such as a pressure source interface or a compressed air supply interface or a venting interface, preferably horizontally, can basically be arranged according to the customer's requirement.
  • this division can also by arranging the first to third area in a non-U-shaped arrangement, for. B. a Z-shaped arrangement can be realized.
  • the air dryer preferably has a desiccant-containing drying container through which compressed air can flow, which has a desiccant-free indentation-forming wall.
  • a drying container has proven to be particularly suitable for receiving the magnetic valve arrangement at least partially, preferably completely, in the indentation.
  • the solenoid valve arrangement can on the one hand be protected from external influences by the drying container and, on the other hand, the heat developing in the solenoid valve arrangement can be used advantageously for drying the dryer.
  • a lid of the drying container is arranged above the indentation.
  • a lid preferably has a vent area divided at least partially by a seal, in particular a molded seal, into pneumatic lines.
  • a ventilation dome of the air dryer can be arranged at least partially in the region of the housing arrangement.
  • a vent dome of the air dryer is at least partially disposed in the region of a lid, wherein the lid is provided above the recess of the drying container.
  • the space-saving drying container and / or the lid forms part of the housing assembly.
  • the lid may be particularly advantageously provided with an integrated seal and / or a check valve for sealing the recess and the solenoid valve assembly contained therein.
  • the lid in addition to a pneumatic functionality - such as a vent dome with pneumatic lines, valves and connections - also have an electrical or control electrical functionality.
  • the cover may in particular be designed to provide pneumatic interfaces such as the compressed air supply interface and the venting interface or a valve in the form of a check valve.
  • the cover can in particular provide an electrical interface, such as a control interface.
  • the magnet valve arrangement has an armature and / or valve seat formed with elastomer and / or metal.
  • a solenoid valve of the solenoid valve assembly to a valve body or a valve seal and / or a valve seat, which abut on an elastomer.
  • a valve body and / or a valve seat can also strike on a metal - an elastomer has also proven to be particularly advantageous for sealing a solenoid valve.
  • an elastomer may tend to settle in the case of operation - depending on the proportion of plasticizers - and in unfavorable cases, an elastomer may cause a valve body or a valve seal to stick or freeze to the valve seat. This can cause the armature of the solenoid valve to become blocked (so-called valve adhesive).
  • valve adhesive blocked
  • Fig. 1 is a circuit diagram of a first pneumatic system 100A with an air spring system and a first compressed air supply system, namely with a solenoid valve assembly in the form of a directly controlled vent solenoid assembly according to a first further developing variant of the invention;
  • FIG. 2 shows a schematic comparison of the energization states (activations on / off) of a normally closed solenoid valve arrangement (A) on the one hand and a normally open solenoid valve arrangement (B) according to one of the described embodiments on the other hand this for the operating states (I) conveying, (II ) Venting / lowering, (III) lifting from storage;
  • FIG. 3 shows a preferred structural realization of a compressed air supply system with a preferred normally open solenoid valve assembly for use in the first compressed air supply system of FIG. 1 - this with symbolic
  • Fig. 4 is an enlarged view of the solenoid valve assembly of Figure 3 in the normally open state with symbolic vent flow P.
  • Fig. 5 in view (B) is an enlarged detail of a first modified normally open solenoid valve assembly in the normally open state for use in a compressed air supply system of Figure 1 - this in contrast to a conventional normally closed solenoid valve assembly in view (A).
  • Fig. 6 in view (A) and (B) two further modifications of a normally open solenoid valve assembly for use in a compressed air supply system of Fig. 1, wherein in the modification (A) is a pressure side under the armature and in the modification (B) - as in Fig. 5 (B) - is a pressure side above the armature;
  • Fig. 7 shows a further modification of a solenoid valve arrangement in which the
  • Valve seat is formed as a metallic stop and in addition as in Fig. 5 (B) or Fig. 6 (B) is realized;
  • Fig. 8 is a circuit diagram of a second pneumatic system 100B with an air spring system and a second compressed air supply system, namely with a solenoid valve assembly in the form of a normally vented indirectly piloted solenoid valve assembly according to a second further developing variant of the invention;
  • Fig. 9 is a circuit diagram of a third pneumatic system 100C with an air spring system and a third compressed air supply system, namely with a solenoid valve arrangement in the form of a rapidly venting indirectly piloted solenoid valve assembly according to a third further developing variant of the invention.
  • Fig. 1 shows a pneumatic system 100A with a compressed air supply system 10A and a pneumatic system 90 present in the form of an air spring system.
  • the air spring system has for this purpose a number of four so-called bellows 91, which are each associated with a wheel of a vehicle, not shown, and a memory 92 for storing rapidly available compressed air for the bellows 91.
  • the bellows 91 and the memory 92 are - in this case a valve block 96 with five valves - each connected via a normally closed solenoid valve 93, 94, to a common, a gallery 95 forming pneumatic line, which forms the pneumatic connection between the compressed air supply system 10 and the pneumatic system 90.
  • the valve block 96 may have other or fewer solenoid valves and / or solenoid valves arranged in a 2-fold valve block. Under a gallery is in general any kind of a manifold to understand, from which branch lines to Bellows 91 or a line to the compressed air supply system 10A go off.
  • the compressed air supply system 10A is used to operate the pneumatic system 90 in the form of the air spring system and supplies the gallery 95 of the same via a compressed air connection 2.
  • the compressed air supply system 10A also has a vent port 3 and an air supply 0 with a suction.
  • the air spring system with the controllable solenoid valves 93, 94 is arranged in the filling direction downstream of the compressed air connection 2. Downstream of the vent port 3 downstream in the venting direction and upstream of the air feed port 0 is a respective filter 3.1 or 0.1.
  • the compressed air supply system 10A also has an air compressor 21 in the form of a compressor which is driven by a motor M to supply the compressed air supply 1 is provided with compressed air.
  • an air dryer 22 and a first throttle 31, here as a regeneration throttle are further arranged.
  • the filter 0.1, the air supply 0, the air compressor 21, the compressed air supply 1, the air dryer 22 and the first throttle 31 are arranged together with the compressed air connection 2 in a leading to gallery 95 compressed air supply line 20 in this order.
  • a venting valve arrangement is provided in the form of a controllable - following the concept of the invention - normally open solenoid valve arrangement 40A with a magnetic part 43A and a pneumatic part 44A for a venting port 3 for discharging air.
  • the solenoid valve arrangement 40A is arranged in a vent line 30 which forms the pneumatic connection with a second throttle 32, serving here as a vent throttle, and the vent connection 3.
  • the pneumatic member 44A is opened.
  • the solenoid valve assembly 40A is designed for direct switching of a compressed air volume.
  • the pneumatic part 44A which can be actuated directly via the magnet part 43 in the vent line 30 of the compressed air supply line 20 is opened between a pressure-side valve connection X1 and a vent-side valve connection Z1.
  • a compressed air connection side forming a pneumatic chamber line section of the vent line 30 to the compressed air supply 1 for pneumatic connection of the solenoid valve assembly 40A to the compressed air supply line 20 is connected. This has the consequence that in the case of a venting of the compressed air supply system 10A via the vent line 30 compressed air is vented, which is removed in front of the air dryer 22, so in simplified terms undried air.
  • the compressed air supply system 10A is formed with a solenoid valve assembly 40A in the form of a directly controlled vent solenoid assembly without a control valve and a control line 68, a direct circuit of the entire compressed air volume is possible.
  • the solenoid valve assembly 40A provides a single solenoid valve as a vent valve. A control valve is not provided. This allows a quick and flexible venting of the pneumatic system 90 or venting the compressed air supply system 10A without an additional control valve. Advantageously, this can save components and installation space. There are also advantageously no essential requirements for a minimum pilot pressure for operation of the compressed air supply system 10A.
  • a multiplicity of operating states can also be realized in an improved manner with regard to the air dryer 22 with the concept of a compressed air supply system described herein, since the solenoid valve arrangement 40A is formed with a single normally open solenoid valve, which is actuated via the control line 68.
  • the compressed air supply 1 is supplied by sucking in air through the filter 0.1 and the air supply 0 with compressed air by the air driven via the motor M air compressor 21 compressed air sucked.
  • the pneumatic system 90 in the form of the air spring system is supplied from the compressed air supply 1 via the air dryer 22 and the first throttle 31 with compressed air.
  • the compressed air supply line 20 of the compressed air supply system 10A is connected to the gallery 95 of the pneumatic system 90 via the compressed air connection 2.
  • the compressed air supply system 10A Upon reaching the storage pressure in the pneumatic system 90, in this case in a pressure range of about 15 to 20 bar in the memory and 5 to 10 bar in the bellows, the compressed air supply system 10A is vented.
  • the solenoid valve assembly 40A For the second throttle 32, a larger nominal diameter dimension is provided than for the first throttle 31, so that a pressure change amplitude which is as large as possible for the regeneration of the air dryer can arise. This allows advantageous venting of the compressed air supply system 10A and / or regeneration of the air dryer 22.
  • the venting line 30 is closed by energizing the solenoid valve arrangement 40A with a control current in order to allow pressure to build up in the accumulator 92.
  • a venting of the compressed air supply system 10A after reaching the storage end pressure, i. upon reaching the so-called memory filling end by switching off the control current for a solenoid part 43A of the normally open solenoid valve assembly 40A done. Venting in the event of a vehicle lowering in normal operation can be done easily by the already open - since normally open - solenoid valve assembly 40A.
  • a regeneration of the air dryer 22 as well as a flexible and rapid venting by design of the nominal diameter of the throttles 31, 32 is advantageously ensured by a suitable pressure drop across the air dryer 22.
  • the compressed air supply system 10A also has a check valve 49, which in the present case has a residual pressure holding function.
  • the check valve 49 serves to prevent a foreign object entry into the compressed air supply system 10A in addition to the filter 3.1.
  • the residual pressure holding function of the check valve 49 serves to maintain a minimum pressure in the compressed air supply system 10A. Due to the over the throttle 31 to the gallery 95 open compressed air supply line 20, the residual pressure is also present for the pneumatic system 90 in the form of the air filter system. This residual pressure - present in the amount of 1, 5 bar - prevents sticking together of the bellows 91 in the event that a venting of the compressed air supply system 10A takes place together with the pneumatic system 90. Concretely, this prevents the bellows walls of the bellows 91 from being pinched or damaged.
  • a pressure limiter 69 of the pneumatic part 44A in which can be limited by tapping the pressure in the vent line 30, the pressure for the solenoid valve assembly 40A.
  • a current-controlled Pressure limiter 69 is particularly advantageous.
  • the switching point of the pneumatic part 44A is variably adjustable depending on the current strength of a control current in the magnetic part 43A.
  • the switching point of the pneumatic part 44A can be set to be variable in current.
  • the current-controlled pressure limiter 69 it is ensured that the gallery pressure does not exceed the static opening pressure of a designed as a solenoid valve 93 level control valve and an internal pressure of a bellows 91.
  • a pressure measurement in the gallery 95 or in the memory 92 can take place.
  • a bellows pressure can not press the solenoid valves 93 and supports a valve spring, in the present case, a bellows pressure rests on a valve armature.
  • a gallery pressure can be so high that a bellows valve is pressed and the vehicle is lifted unintentionally. This could lead to unstable driving conditions.
  • a pressure limiter certainly avoids such a case in systems with closed vent circuits. In a presently described normally open circuit, however, such a danger is avoided per se, since an air compressor would mostly promote the outdoors.
  • Fig. 2 shows for three different modes of operation - conveyors (I), venting or lowering (II) and lifting from memory 92 (III) - the Bestromungsschreib the normally open solenoid valve assembly 40A in view (B) according to a preferred embodiment of the invention.
  • This is compared to - for illustration - as a comparison of the BestromungsSullivan a normally closed solenoid valve in view (A) which is replaced by the solenoid valve 40A.
  • the drive state "ON” describes an energization of a solenoid valve arrangement and the drive state "OFF” denotes a non-energized state of a solenoid valve arrangement.
  • Lifting of the vehicle body may be accomplished via compressed air stored in the accumulator 92 by opening the solenoid valve 94 and, optionally, all or some of the solenoid valves 93.
  • the normally open solenoid valve arrangement 40A is energized for this operating state (III), ie closed (no. 2).
  • the cycle rate of actuation, ie energization or switching frequency, of the normally open solenoid valve arrangement 40A is lower when all operating states (I), (II) and (III) are considered together become. It has been found that this is particularly relevant for fast and flexible to operate compressed air supply systems, for example, for use in an off-road vehicle or SUV. For frequently changing operating states (I), (II), and (III), a compressed air supply system 10A with a normally open solenoid valve arrangement 40A has proven to be particularly advantageous. In addition, a long-lasting contact of valve body and valve seat in the normally open solenoid valve assembly 40A is advantageously prevented to avoid valve adhesives.
  • the compressed air supply system 10, 10A, 10B, 10C in the form of a device with a housing assembly 50 is formed, which has a number of areas, wherein in a first region 51, a motor M and / or in a second region 52nd the air compressor 21 drivable by the engine M and / or in a third area 53 of the air dryer 22 connected to the second area 52 via a pressure source interface E1 and the solenoid valve arrangement 40, 40A, 40B, 40C.
  • Fig. 3 and Fig. 4 show concretely two structurally realized preferred embodiments of a compressed air supply system 10, 10 'with a normally open solenoid valve assembly 40.
  • the compressed air supply systems 10, 10' are each implemented as a device with a housing assembly 50 having a number of housing areas , In a first region 51, a drive in the form of a motor M and in a second region 52 of the motor M driven by the air compressor 21 is arranged.
  • the air compressor 21 has a piston 55 which can be moved back and forth in the compression space 54 and which is driven by the motor M via a shaft and a connecting rod 56.
  • the compression space 54 is supplied with air via an air supply interface E0 of the above-mentioned air supply 0.
  • Compressed air located at the outlet of the compression chamber 54 is transferred via an outlet valve 57 or the like to a pressure source interface E1 for the above-mentioned compressed air supply 1.
  • the compressed air is discharged into a third region 53 of the compressed air supply system 10, 10 '.
  • the third area 53 contains the air dryer 22 with drying container 58 and the - in the compressed air supply system 10 'of Fig. 4 larger shown - normally open solenoid valve assembly 40.
  • the housing areas corresponding housing parts A, B, C are assigned, which optionally one or more seals D are sealed against each other.
  • a housing part C and a cover T terminating the housing part C on the bottom side or, in the case of FIG. 4, covers the cover T' are associated with the third area 53.
  • the air dryer 22 to a desiccant-containing compressed air flow through the drying container 58, which has a desiccant-free indentation G forming wall W, wherein the solenoid valve assembly 40, 40A, 40B, 40C at least partially, preferably completely, is arranged in the recess G.
  • the third housing part C is formed by a wall W of the dry container 58 filled with dry granules and the cover T or in FIG. 4 cover T '. The dry granules are pressurized by a spring F in the drying container 58 held.
  • the wall W forms on the bottom side of the drying container 58 a symmetrical, ie in the present case parallel and central, arranged to an axis of the drying container 58 indentation G, which is free of desiccant.
  • the venting valve assembly in the form of normally open solenoid valve assembly 40 is housed symmetrically to the axis of the drying container 58.
  • the lid T, T ' closes the indentation G tightly together with the magnet valve arrangement 40 located therein.
  • a cover T, T 'of the drying container 58 is advantageously arranged above the indentation (G) and has a ventilation region, which is subdivided at least partially by a seal 71 into pneumatic lines 72.
  • the cover T, T 'as part of the housing assembly 50 of the compressed air supply system 10 not only seals 71 for sealing the housing part C of the compressed air supply system 10, 10'.
  • protrude into the lid T, T 'as part of a vent dome of the air dryer 22 lines 72 which connect to corresponding feedthroughs in the drying tank 58 and in the lid T, T' are performed.
  • the cover T, T ' is interrupted by interfaces, E2 forming a pressure source interface at the compressed air connection and E3 a venting interface at the venting connection 3 forms the compressed air supply system 10.
  • the control interface S is used for connection to the above-mentioned control line 68 of the solenoid valve assembly 40th
  • a particularly compact arrangement of the normally open solenoid valve arrangement 40 in the drying container 58 i. concretely reach in the indentation G formed by this.
  • a valve seat and a valve body of the pneumatic part is arranged in the recess G.
  • Fig. 4 shows an enlarged view of a modified with the lid T 'embodiment described in Fig. 3 air dryer 22 at a compressed air supply system 10', wherein expediently the same reference numerals are used for the same or similar parts or parts of the same or similar function.
  • the arrows in this case show a vent flow P from the gallery 95 at vent, i. when energized open state of the solenoid valve assembly 40. This is as explained in a formed by the wall W of the housing part C indentation G of the drying container 58 completely arranged.
  • the magnetic member 43 is presently formed by a bobbin 63 and a single armature 61 B, which by the bobbin 63 when energized - to close the solenoid valve assembly 40 - is activated. It can be seen that the armature 61 B when the coil body 63 is de-energized is fixed by a valve spring 65 such that a valve sealing element 61 A mounted on the armature 61 B is lifted off a valve seat 61 C associated with the valve sealing element 61 A.
  • the compressed air can as a vent flow P through a throttle 32 forming channel 66 in a magnetic core 62 and the armature 61 B over - ie flow through the bobbin 63 - by a cover in the lid T 'guided ventilation dome, namely the channels 72 to the vent interface E3 escape the vent port 3.
  • the armature 61 B is disposed in a non-magnetic armature guide tube 64.
  • the solenoid valve assembly 40 in the indentation G of the drying container 58 an air-permeable channel through the drying vessel 58, which has one of the solenoid valve assembly 40 upstream clean space 67, wherein the free space 67 and the solenoid valve assembly 40 arranged axially to each other are.
  • the free space 67 is thus part of the above-described vent line 30.
  • the check valve 49 with residual pressure function which is not described here in more detail with reference to FIG. 1, is also incorporated in the cover T '.
  • the incorporation of the check valve 49 together with a part of the vent dome in the lid T ' is flow-optimized, so that this is a flexible and fast venting and ventilation of the compressed air supply system 10 and the pneumatic system 90 is beneficial.
  • the lid T ' is modular in the present case. He has for this purpose a first cover plate T1 for displaying a pneumatic functionality - namely the channels 72, the molded seal 71 and the interfaces E2, E3 - on.
  • the cover T also has a second cover plate T2 for representing an electrical and / or control electrical functionality - namely, the interface S and an electronic control unit SE, which connects the interface S to the connection S '.
  • FIG. 5 shows in view (B) with Fig. 6 (B) and Fig. 7 the principle similar and normally open position of the solenoid valve assembly 40 'with a symbolically represented compressed air flow Q.
  • the flow Q in the direction of the vent flow P of FIG. 5 (B) illustrates a compressed air flow from the duct 66 to an opening 74 forming the throttle 32 on the magnetic core 62 and to two first openings 73 connected to the ducts 72 shown in FIG.
  • the armature 61 B is pressed against a stop 75 when the bobbin 63 is de-energized by the spring force of the valve spring 65, here the compression spring.
  • the armature 61 B is pulled against the spring force of the valve spring 65 in the bobbin 63, so that the valve sealing member 61 A on the valve seat 61 C comes to rest and the normally open solenoid valve assembly 40 'closes.
  • a second opening 76 in the stop 75 between the two first openings 73 is released.
  • the operation for the example of a normally closed solenoid valve 400 is different.
  • the armature is urged by the spring force of the valve spring 650 with its valve sealing member 610A against the assembly formed by a single seat opening 760 and the valve seat 610C, thus closing in an energized state, i.
  • energized coil body 630 closes the normally closed solenoid valve assembly 400.
  • the armature 610 is pulled into the bobbin 630 against the spring force of the valve spring 650, so that the valve sealing member 610A is lifted from the valve seat 610C and the seat opening 760 releases.
  • the compressed air of the flow Q can flow from a channel 660 into the throttle-forming channel opening 740, past the armature 610 through the seat opening 760.
  • FIG. 6 (A) shows, in a modification to FIG. 6 (B) identical to FIG. 5 (B), a normally open solenoid valve arrangement 40 ", in which a pressure built up again by the compressed air of a flow Q in the direction of the vent flow P is established in energized closed state under the armature 61 is located.
  • a pressure of the compressed air is in the energized closed state above the armature 61 B.
  • FIG. 6 (A) shows a substantially mirrored arrangement for this purpose the components of the solenoid valve assembly 40 "compared to the solenoid valve assembly 40 '.
  • the effects of the valve spring 65 in the form of a compression spring and the operation of the bobbin 63 have already been described with reference to Fig. 5 (B).
  • the solenoid valve arrangement 40, 40A, 40B, 40C advantageously has an armature 61B and / or valve seat 61C formed with elastomer and / or metal.
  • FIG. 7 shows a modification of an electrolessly open solenoid valve arrangement 40 "', which is largely similar in design and practically identical in function to FIG. 5 (B) and FIG. 6 (B), in which, unlike FIG. 5 (B) and FIG 6 (B) a valve seat 61 C is designed as a metal stop which lies opposite a metallic valve seal 61 A.
  • valve seal 61 A and the valve seat 61 C are arc-shaped and come with adapted shaping of the surfaces of the valve seal 61 A and of the Valve seat 61 C to each other without elastomeric valve sealing element, as shown in Fig. 6 (B) and Fig. 5 (B).
  • FIG. 8 and 9 show two preferred embodiments of a solenoid valve arrangement 40B, 40C, in which a relay valve 40.2B, 40.2C for holding a residual pressure is arranged in the ventilation line 30.
  • the relay valve 40.2B, 40.2C is designed to hold a residual pressure in the range up to 1 bar, in particular a residual pressure up to 3 bar.
  • the compressed air supply system 10B, 10C provides that the pneumatic part 44B, 44C that can be actuated directly via the magnet part 43B, 43C is connected in a branch line, the compressed air supply line 20 - according to FIG. 9 in a control branch 47 or in FIG.
  • a pressure-side valve port X2 and a control-side valve port Y2 of the branch line is opened.
  • the pneumatic part 44B, 44C in the form of a 3/2-way valve in the solenoid valve assembly 40B, 40C is formed and opened in the branch line of the compressed air supply line 20 for the pneumatic control of a relay valve 40.2B, 40.2C in the vent line 30.
  • the relay valve 40.2B, 40.2C is in a pilot-controlled state such that when the pressure is applied Laisventil 40.2B, 40.2C between a pressure-side valve port XV and a vent-side valve port ZV opens.
  • FIG. 8 - for a pneumatic system 100B not shown in detail with the known pneumatic system 90 - a compressed air supply system 10B, in turn, the same reference numerals are used for identical or similar parts or parts identical or similar function.
  • the present compressed air supply system 10B provides a solenoid valve arrangement 40B, which is normally open in the form of a so-called normally vented pilot-operated arrangement.
  • the solenoid valve assembly 40B consists of a normally open solenoid valve as a control valve 40.1 B with a magnetic part 43B and a pneumatic part 44B. Part of the pneumatic part 44B is the relay valve 40.2B.
  • the total pressure of the air pressure volume in the compressed air supply line 20 is applied to the control valve 40.1 B, which - as a normally open version - transmits this to the relay valve 40.2B in the uncontrolled state of the magnetic part 43B as pilot pressure.
  • This arrangement can be realized with comparatively small diameters at the control valve 40.1 B and yet comparatively large diameters of the throttle 32 in comparison to the throttle 31 at the relay valve 40.2B to vent a compressed air volume from the compressed air supply line 20 to the vent 3 via the branch line 48.
  • the total pressure of the open-ended open control valve 40.1 B lies in the first branch line 47.1 designed as a vent line and thus also at the relay valve 40.2B.
  • the compressed air supply line 20 and the second branch line 47.2 is secured with a first check valve 49.1.
  • the entire air flow is directed at a vent by the control valve 40.1 B via the throttle 31 and the second check valve 49.2, and by the air dryer 22 and the throttle 32 and then pilot operated open relay valve 40.2B in the vent line 30.
  • the relay valve 40.2B switches immediately as a result of the control pressure applied to the further control valve connection Y1 '; the control pressure is via an open pressure-side valve port X2 and an open control valve port Y2 of the open in the first branch 47.1 normally open control valve 40.1 B to the other control-side valve port YV mediates.
  • the second check valve 49.2 prevents the control of the relay valve 40.2B via the second branch 47.2 when conveying an air flow from the compressed air supply 1 to the compressed air connection 2 when the control valve 40.1 B is also closed, ie energized, is.
  • the first check valve 49.1 also blocks the gallery 95 from the air dryer 22, in order to avoid undesired filling of the air dryer 22 with changing pressures in the pneumatic system 90.
  • the control valve 40.1 B is also closed, ie energized.
  • Fig. 9 shows a pneumatic system 100C with a compressed air supply system 10C and a pneumatic system 90, in the present case in the form of an air spring system.
  • the same reference numerals have been used as in FIG. In the following, reference is made in particular to the differences between FIGS. 1 and 8.
  • the pneumatic system 100C is equipped with a compressed air supply system 10C, in which the solenoid valve arrangement 40C is again normally open but presently designed as a rapidly venting indirectly pilot operated solenoid valve arrangement 40C.
  • the normally open solenoid valve assembly 40C for indirectly switching a compressed air volume has a partial pressure exposed control valve 40.1C for controlling a relay valve 40.2C.
  • the control valve 40.1 C is formed in the form of a solenoid valve with a magnetic part 43C and a pneumatic part 44C, wherein the relay valve 40.2C is part of the pneumatic part 44C.
  • the solenoid valve arrangement 40C When the solenoid valve arrangement 40C is in the normally open state, the solenoid part 43C of the control valve 40.1C is in a non-activated state and the pneumatic part 44C of the control valve 40.1C is opened between a pressure-side valve connection X2 and a control-side valve connection Y2 in the control branch line 47 designed as control line , The control pressure is applied to the control-side valve port YV of the relay valve 40.2C in the control branch 47. Thus, the relay valve 40.2C is in a pilot-controlled state.
  • the main compressed air volume is vented via the third branch line 48 and the throttle 32 as well as the relay valve 40.2C to the vent 3.
  • An advantage of this fast venting solenoid valve assembly 40C in the compressed air supply system 10C is that not the entire compressed air volume must be performed via a single solenoid valve, but already a small partial pressure of a designed via the control line control branch 47 to the control valve 40.1 C supplied partial pressure air volume is sufficient.
  • This design similar to a positively controlled or servo-controlled valve arrangement, allows the operating pressure to be increased to a comparatively high pressure level and, at the same time, the switching of high volumes of compressed air via the relay valve 40.2C is made possible.
  • the relay valve 40.2C can be designed with a comparatively large nominal diameter.
  • the ratio of the smaller diameter of the first throttle 31 to the larger diameter of the second throttle 32 is selected so that an effective regeneration of the air dryer 22 at a venting of the compressed air supply system 10C is possible.
  • the common feature is that a relay valve 40.2B or 40.2C of a solenoid valve assembly 40B or 40C in a "dry" line -along in the venting direction "behind" the air dryer 22- namely respectively
  • a relay valve 40.2B or 40.2C will be damaged due to external influences, for example freezing or the like
  • both indirectly pilot operated solenoid valve arrangements 40B, 40C require one Minimum pilot pressure in order to be able to release with the relay piston of the relay valve 40.2B, 40.2C a necessary minimum cross section, namely at least the cross section of the throttle 32.
  • a relay-pressure limiter 49 'of the relay valve 40.2B, 40.2C be provided, in which can be limited by tapping the pressure in the branch line 48, the pressure for the relay valve 40.2B, 40.2C , In this way, even with a comparatively high operating pressure, a certain variability or tolerance with regard to pressure limitation can be achieved.
  • a first throttle 31 in the compressed air supply system 10C can be selected to be larger than a first throttle 31 in the compressed air supply system 10B; the reason is that a main vent flow is not routed through the control valve 40.1C.
  • a faster venting or discharging of compressed air from a pneumatic system 100C can take place than is the case with a pneumatic system oil.
  • a good regeneration of the air dryer 22 is also achieved in the compressed air supply system 10C while adapting, preferably increasing, the nominal diameter of the second throttle 32.
  • a pressure limiter for all previously described solenoid valve assemblies 40A, 40B, 40C provide a current-adjustable pressure relief.
  • the pneumatic part 44A, 44B, 44C may have an opening pressure which can be set via the magnetic part 43A, 43B, 43C.
  • setting a higher or lower current limits a maximum pressure to a higher or lower value.
  • the invention relates to a compressed air supply system 10, 10A, 10B, 10C for operating a pneumatic system 90, in particular an air suspension system of a vehicle, comprising:
  • a pneumatic connection in particular a vent line (30), with a vent valve assembly in the form of a controllable solenoid valve assembly 40, 40A, 40B, 40C with a magnetic part 43A, 43B, 43C and a pneumatic part 44, 44A, 44B, 44C, and with a vent port 3 for venting air, and
  • a pneumatic connection in particular a compressed air supply line 20, with an air dryer 22 and a compressed air connection 2 for supplying the pneumatic system 90 with compressed air.
  • the pneumatic part 44, 44A, 44B, 44C of the solenoid valve arrangement 40, 40A, 40B, 40C is opened.
  • first branch line as a vent line

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un dispositif d'alimentation en air comprimé (10, 10A, 10B, 10C) servant à faire fonctionner un dispositif pneumatique (90), notamment un dispositif d'amortissement pneumatique d'un véhicule, présentant : une alimentation en air (0) et un compresseur d'air (21) servant à alimenter en air comprimé une arrivée d'air comprimé (1); une liaison pneumatique, notamment une conduite de purge d'air (30), comportant un ensemble vanne de purge d'air se présentant sous la forme d'un ensemble électrovanne commandable (40, 40A, 40B, 40C) comprenant une partie magnétique (43, 43A, 43B, 43C) et une partie pneumatique (44, 44A, 44B, 44C), ainsi qu'un raccord de purge d'air (3) servant à évacuer de l'air; et une liaison pneumatique, notamment une conduite d'alimentation en air comprimé (20), comportant un dessiccateur d'air (22) et un raccord d'air comprimé (2) destiné à alimenter en air comprimé le dispositif pneumatique (90). Selon l'invention, la partie pneumatique (44, 44A, 44B, 44C) de l'ensemble électrovanne (40, 40A, 40B, 40C) est ouverte lorsque la partie magnétique (43, 43A, 43B, 43C) de l'ensemble électrovanne (40, 40A, 40B, 40C) n'est pas excitée.
PCT/EP2011/005863 2010-12-16 2011-11-22 Dispositif d'alimentation en air comprimé et système pneumatique WO2012079688A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP13005906.6A EP2743103B2 (fr) 2010-12-16 2011-11-22 Système d'alimentation en air comprimé et un système pneumatique
US13/993,839 US9694801B2 (en) 2010-12-16 2011-11-22 Compressed air supply installation and pneumatic system
ES11787798T ES2525020T5 (es) 2010-12-16 2011-11-22 Instalación de suministro de aire comprimido y sistema neumático
EP11787798.5A EP2651671B2 (fr) 2010-12-16 2011-11-22 Système d'alimentation d'air et système pneumatique
US15/594,664 US10093144B2 (en) 2010-12-16 2017-05-15 Compressed air supply installation and pneumatic system

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ES2525020T3 (es) 2014-12-16
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US20170246928A1 (en) 2017-08-31
EP2743103B2 (fr) 2023-01-04
EP2743103B1 (fr) 2016-02-03
EP2651671A1 (fr) 2013-10-23
ES2568608T3 (es) 2016-05-03
US10093144B2 (en) 2018-10-09
DE102010054712A1 (de) 2012-06-21
ES2525020T5 (es) 2021-06-07
EP2651671B2 (fr) 2020-09-23
DE102010054712B4 (de) 2023-06-07
US9694801B2 (en) 2017-07-04
EP2743103A1 (fr) 2014-06-18

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